The question might not be clear but I would like knowing which state holds crit races, for car 5, the most. Because, I might have a two weeks vacation and I would like to do as much crits as I can in that period.

There's a very active criterium scene in the SF Bay Area and in SoCal around the LA area, though now until summer is road racing season. Crits start to really pick up then since nobody wants to ride in the blazing heat for a few hours a day, and that's when there'll be crits 2-3x a week.

Also the SF Bay Area is just great in general for bike riding. Great scenery, pretty good bike infrastructure, and really friendly people.

If it's in early August, the Crossroads Classic in North Carolina is right around then. Six southern-fried crits in 6 days, and there is usually a race or two the weekend after. These are big races- the highlight of the year for us. Occasionally they'll run the cat 5s under the lights, right before the P/1/2 race so you get some big crowds. Hopefully the schedule is up soon.

In the Dallas/Fort Worth there are training series crits on Tuesdays, Wednesdays, and Thursdays. As well as many weekends. I don't really recommend cycling in Texas as a destination, but yeah we've got crits. http://www.txbra.org/events/

Seems like lots of places have a weekly series of some sort. Here in Salt Lake we have a weekly training series with crits on Tuesday and Wednesday and a TT on Thursday.
Basically we figure if you start racing in April, you can get your Cat 4 upgrade by May.
If you've got two weeks, come out to Salt Lake. You'll be able to get in 4 crits and, if you time it right, 2 road races. It's also the only time of year that isn't freezing cold or deathly hot.

Just race wherever you are at. Starting this next weekend. What is this I want to race a bunch of Cat 5 races in Aug bullshit? You should not be a 5 in Aug, and if you are then this whole discussion is silly.